标题： 大尺度功率谱全形状的新模型 显示英文标题

标题： A new model for the full shape of the large-scale power spectrum

摘要： 我们基于重正化微扰理论提出了一种用于大尺度功率谱完整形状的新模型。 为了检验这一方法的有效性，我们将此模型与一套包含50个大体积、中等分辨率N体模拟所测量的功率谱进行了比较。 我们的结果显示，这个简单的模型在考虑非线性演化、红移空间畸变和尺度k < 0.15 h/Mpc下的晕星系偏倚的情况下，能够准确描述功率谱的完整形状，使其成为分析即将到来的星系巡天的一个有价值的工具。 尽管它的应用局限于大尺度，但该方法提供的暗能量状态方程参数w_{DE}的约束比仅通过建模重子声波振荡信号获得的约束更紧，因为后者忽略了功率谱宽频形状的信息。 我们的模型能够提供与通过类似模型应用于相关函数完整形状得到的约束相当的结果，而相关函数受到不同的系统误差影响。 因此，通过精确建模功率谱，可以从这两种统计方法中提取相同的宇宙学信息。 显示英文摘要

摘要： We present a new model for the full shape of large-scale the power spectrum based on renormalized perturbation theory. To test the validity of this prescription, we compare this model against power spectra measured in a suite of 50 large volume, moderate resolution N-body simulations. Our results indicate that this simple model provides an accurate description of the full shape of the power spectrum taking into account the effects of non-linear evolution, redshift-space distortions and halo bias for scales k < 0.15 h/Mpc, making it a valuable tool for the analysis of forthcoming galaxy surveys. Even though its application is restricted to large scales, this prescription can provide tighter constraints on the dark energy equation of state parameter w_{DE} than those obtained by modelling the baryonic acoustic oscillations signal only, where the information of the broad-band shape of the power spectrum is discarded. Our model is able to provide constraints comparable to those obtained by applying a similar model to the full shape of the correlation function, which is affected by different systematics. Hence, with accurate modelling of the power spectrum, the same cosmological information can be extracted from both statistics.